Frederick Penczak, MD
NPI 1841379070 · Surgery Physician · San Rafael, CA
Enrolled with Medicare as Practitioner - General Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Frederick Penczak, MD is a Surgery Physician provider in San Rafael, CA (NPI 1841379070).
Provider details
- NPI number
- 1841379070
- Entity type
- Individual
- Primary specialty
- Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 00A685120 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
275 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Replacement of Thigh Bone and Hip Joint With Prosthesis27130 | 128 | $232 |
| Replacement of Knee Joint, Both Sides of Knee27447 | 99 | $232 |
| Treatment of Upper End of Broken Thigh Bone With Placement of Stabilizing Device Or Prosthetic Replacement27236 | 30 | $219 |
| Treatment of Broken Neck of Thigh Bone With Bone Implant27245 | 18 | $223 |
Typical Medicare-allowed amounts for these services range $219–$232 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-06
- Last updated
- 2014-04-25
Frequently asked questions
- What is Frederick Penczak's NPI number?
- Frederick Penczak's National Provider Identifier (NPI) is 1841379070, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Frederick Penczak's specialty?
- Frederick Penczak is listed in the NPPES registry with a primary specialty of Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Frederick Penczak located?
- Frederick Penczak's practice location on file with NPPES is 78 Creekside Dr, San Rafael, CA 94903-1055.
- What is Frederick Penczak's phone number?
- The practice phone number listed in the NPPES registry for Frederick Penczak is (707) 939-7411.
- Does Frederick Penczak accept Medicare?
- Frederick Penczak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Frederick Penczak's NPI active?
- Yes — Frederick Penczak's NPI (1841379070) is active in the NPPES registry as of the last update on 2014-04-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.